Single ply roof guarantees typically cover 15-20 years, but the actual roof can...

https://knoxuqsk688.cavandoragh.org/do-certified-installers-really-make-a-roof-last-longer

Single ply roof guarantees typically cover 15-20 years, but the actual roof can last 25-40 years with proper care. Guarantees focus on workmanship and materials at installation, not everyday wear and tear